To clarify... When I line up 2 notes in Sonar the Note Off occurs right before the next Note On. Neither one gets triggered. The further apart the notes / messages are, the better they trigger.By High / Low, I meant the Voltages. The voltage levels at which the pin goes high or low. There are different tolerances for different chips.

Yep. Just with the UM880. Setting the releases to 0 or 255 made no difference.

I guess the next step, if you are up for it, is to create a test PreenFM OS that will print the incoming MIDI messages to the screen. We can then check to see if the synth is receiving correct MIDI messages, bad messages, incomplete messages or no messages at all... Just an idea.

Running Status! I really should have thought to ask about that one. So I tried D4 first... disobeying orders ... and so far it works perfectly! Next, I tried D3... not so good... lots of W messages. So Running Status it was!Thanks!!! You rock! etc. Martin